mtd: generic FSMC NAND MTD driver

This is the same driver submitted by ST Micros SPEAr team but
generalized and tested on the ST-Ericsson U300. It probably
easily works on the NHK8815 too.
Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/Kconfig

@@ -524,4 +524,11 @@ config MTD_NAND_JZ4740
 	help
 		Enables support for NAND Flash on JZ4740 SoC based boards.
 
+config MTD_NAND_FSMC
+	tristate "Support for NAND on ST Micros FSMC"
+	depends on PLAT_SPEAR || PLAT_NOMADIK || MACH_U300
+	help
+	  Enables support for NAND Flash chips on the ST Microelectronics
+	  Flexible Static Memory Controller (FSMC)
+
 endif # MTD_NAND

drivers/mtd/nand/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_MTD_NAND_PPCHAMELEONEVB)	+= ppchameleonevb.o
 obj-$(CONFIG_MTD_NAND_S3C2410)		+= s3c2410.o
 obj-$(CONFIG_MTD_NAND_DAVINCI)		+= davinci_nand.o
 obj-$(CONFIG_MTD_NAND_DISKONCHIP)	+= diskonchip.o
+obj-$(CONFIG_MTD_NAND_FSMC)		+= fsmc_nand.o
 obj-$(CONFIG_MTD_NAND_H1900)		+= h1910.o
 obj-$(CONFIG_MTD_NAND_RTC_FROM4)	+= rtc_from4.o
 obj-$(CONFIG_MTD_NAND_SHARPSL)		+= sharpsl.o

include/linux/mtd/fsmc.h

+/*
+ * incude/mtd/fsmc.h
+ *
+ * ST Microelectronics
+ * Flexible Static Memory Controller (FSMC)
+ * platform data interface and header file
+ *
+ * Copyright © 2010 ST Microelectronics
+ * Vipin Kumar <vipin.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef __MTD_FSMC_H
+#define __MTD_FSMC_H
+
+#include <linux/platform_device.h>
+#include <linux/mtd/physmap.h>
+#include <linux/types.h>
+#include <linux/mtd/partitions.h>
+#include <asm/param.h>
+
+#define FSMC_NAND_BW8		1
+#define FSMC_NAND_BW16		2
+
+/*
+ * The placement of the Command Latch Enable (CLE) and
+ * Address Latch Enable (ALE) is twised around in the
+ * SPEAR310 implementation.
+ */
+#if defined(CONFIG_MACH_SPEAR310)
+#define PLAT_NAND_CLE		(1 << 17)
+#define PLAT_NAND_ALE		(1 << 16)
+#else
+#define PLAT_NAND_CLE		(1 << 16)
+#define PLAT_NAND_ALE		(1 << 17)
+#endif
+
+#define FSMC_MAX_NOR_BANKS	4
+#define FSMC_MAX_NAND_BANKS	4
+
+#define FSMC_FLASH_WIDTH8	1
+#define FSMC_FLASH_WIDTH16	2
+
+struct fsmc_nor_bank_regs {
+	uint32_t ctrl;
+	uint32_t ctrl_tim;
+};
+
+/* ctrl register definitions */
+#define BANK_ENABLE		(1 << 0)
+#define MUXED			(1 << 1)
+#define NOR_DEV			(2 << 2)
+#define WIDTH_8			(0 << 4)
+#define WIDTH_16		(1 << 4)
+#define RSTPWRDWN		(1 << 6)
+#define WPROT			(1 << 7)
+#define WRT_ENABLE		(1 << 12)
+#define WAIT_ENB		(1 << 13)
+
+/* ctrl_tim register definitions */
+
+struct fsms_nand_bank_regs {
+	uint32_t pc;
+	uint32_t sts;
+	uint32_t comm;
+	uint32_t attrib;
+	uint32_t ioata;
+	uint32_t ecc1;
+	uint32_t ecc2;
+	uint32_t ecc3;
+};
+
+#define FSMC_NOR_REG_SIZE	0x40
+
+struct fsmc_regs {
+	struct fsmc_nor_bank_regs nor_bank_regs[FSMC_MAX_NOR_BANKS];
+	uint8_t reserved_1[0x40 - 0x20];
+	struct fsms_nand_bank_regs bank_regs[FSMC_MAX_NAND_BANKS];
+	uint8_t reserved_2[0xfe0 - 0xc0];
+	uint32_t peripid0;			/* 0xfe0 */
+	uint32_t peripid1;			/* 0xfe4 */
+	uint32_t peripid2;			/* 0xfe8 */
+	uint32_t peripid3;			/* 0xfec */
+	uint32_t pcellid0;			/* 0xff0 */
+	uint32_t pcellid1;			/* 0xff4 */
+	uint32_t pcellid2;			/* 0xff8 */
+	uint32_t pcellid3;			/* 0xffc */
+};
+
+#define FSMC_BUSY_WAIT_TIMEOUT	(1 * HZ)
+
+/* pc register definitions */
+#define FSMC_RESET		(1 << 0)
+#define FSMC_WAITON		(1 << 1)
+#define FSMC_ENABLE		(1 << 2)
+#define FSMC_DEVTYPE_NAND	(1 << 3)
+#define FSMC_DEVWID_8		(0 << 4)
+#define FSMC_DEVWID_16		(1 << 4)
+#define FSMC_ECCEN		(1 << 6)
+#define FSMC_ECCPLEN_512	(0 << 7)
+#define FSMC_ECCPLEN_256	(1 << 7)
+#define FSMC_TCLR_1		(1 << 9)
+#define FSMC_TAR_1		(1 << 13)
+
+/* sts register definitions */
+#define FSMC_CODE_RDY		(1 << 15)
+
+/* comm register definitions */
+#define FSMC_TSET_0		(0 << 0)
+#define FSMC_TWAIT_6		(6 << 8)
+#define FSMC_THOLD_4		(4 << 16)
+#define FSMC_THIZ_1		(1 << 24)
+
+/* peripid2 register definitions */
+#define FSMC_REVISION_MSK	(0xf)
+#define FSMC_REVISION_SHFT	(0x4)
+
+#define FSMC_VER1		1
+#define FSMC_VER2		2
+#define FSMC_VER3		3
+#define FSMC_VER4		4
+#define FSMC_VER5		5
+#define FSMC_VER6		6
+#define FSMC_VER7		7
+#define FSMC_VER8		8
+
+static inline uint32_t get_fsmc_version(struct fsmc_regs *regs)
+{
+	return (readl(&regs->peripid2) >> FSMC_REVISION_SHFT) &
+				FSMC_REVISION_MSK;
+}
+
+/*
+ * There are 13 bytes of ecc for every 512 byte block in FSMC version 8
+ * and it has to be read consecutively and immediately after the 512
+ * byte data block for hardware to generate the error bit offsets
+ * Managing the ecc bytes in the following way is easier. This way is
+ * similar to oobfree structure maintained already in u-boot nand driver
+ */
+#define MAX_ECCPLACE_ENTRIES	32
+
+struct fsmc_nand_eccplace {
+	uint8_t offset;
+	uint8_t length;
+};
+
+struct fsmc_eccplace {
+	struct fsmc_nand_eccplace eccplace[MAX_ECCPLACE_ENTRIES];
+};
+
+/**
+ * fsmc_nand_platform_data - platform specific NAND controller config
+ * @partitions: partition table for the platform, use a default fallback
+ * if this is NULL
+ * @nr_partitions: the number of partitions in the previous entry
+ * @options: different options for the driver
+ * @width: bus width
+ * @bank: default bank
+ * @select_bank: callback to select a certain bank, this is
+ * platform-specific. If the controller only supports one bank
+ * this may be set to NULL
+ */
+struct fsmc_nand_platform_data {
+	struct mtd_partition	*partitions;
+	unsigned int		nr_partitions;
+	unsigned int		options;
+	unsigned int		width;
+	unsigned int		bank;
+	void			(*select_bank)(uint32_t bank, uint32_t busw);
+};
+
+extern int __init fsmc_nor_init(struct platform_device *pdev,
+		unsigned long base, uint32_t bank, uint32_t width);
+extern void __init fsmc_init_board_info(struct platform_device *pdev,
+		struct mtd_partition *partitions, unsigned int nr_partitions,
+		unsigned int width);
+
+#endif /* __MTD_FSMC_H */